Single N₁ and N₂ vehicles with fluted brake drums for parking brakes cannot be inspected on roller and plate test benches or in test drives. Electric parking brake systems cannot be tested on roller and plate test benches or test drives, and wheels cannot be turned on lifts to inspect for damages or bearing wear. Some vehicles have hydraulic braking systems with brake fluid reservoirs not accessible without dismantling or special tools, requiring removal of covers, fasteners, and screws to access brake fluid for inspection. PTI inspection provisions require updating to address these vehicle design variations.

LED replacement light sources without type approval are being sold online and offline and are unsafe for public roads; vehicles equipped with such products would fail PTI. LED replacement light sources with type approval are available either at national level or according to UN R37, and are safe and legal for public roads; vehicles equipped with approved LED replacement light sources shall NOT fail PTI. Approval marking on installed light sources is not accessible during PTI; verification may involve a sticker on headlamp housing, type approval documents, or packaging, with removal of the light source as a last resort to verify the approval marking.